Menstrual Cycle Calculator
Predict your next period and upcoming cycles.
Your next 3 predicted periods:
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Cycle 1
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Cycle 2
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Cycle 3
This calculator provides a general estimate for informational purposes only. It is not a medical device and does not provide medical advice or diagnosis. Always consult a qualified healthcare professional about your individual health circumstances.
Frequently Asked Questions
How does this cycle predictor work?
It projects your upcoming periods by repeatedly adding your average cycle length to your last period's start date. It assumes your cycle length stays fairly consistent.
Why does it only predict a few cycles ahead?
Cycle length can vary naturally month to month, so predictions further into the future become progressively less reliable. Your very next predicted date is the most trustworthy of the three — treat cycles 2 and 3 as rough guides rather than firm dates.
What counts as a regular cycle?
Cycles between 21 and 35 days are generally considered typical. If your cycles are consistently outside this range, it's worth discussing with a healthcare professional.
Want lab-grade insight to go with this estimate?
LH Ovulation Test Kit
